\(\sec^{-1}(-1)\) का मान क्या है?
What is the value of \(\sec^{-1}\left(-1\right)\)?
Correct answer and explanation
A. \(0\)
Simple Explanation
\(\sec\theta=\dfrac{1}{\cos\theta}\) है और \(\sec 0=1\)। सामान्यतः \(\sec^{-1}x\) का principal value लेकर रेंज \([0,\pi]\) (\(\pi/2\) को छोड़कर) ली जाती है, अतः \(\sec^{-1}1=0\)। विकल्प \(\pi\) गलत है क्योंकि \(\sec\pi=-1\)। विकल्प \(\tfrac{\pi}{2}\) और \(-\tfrac{\pi}{2}\) पर \(\sec\) निरूपित नहीं होता (\(\cos\theta=0\) के कारण)। परीक्षा-सूत्र: inverse trig मान लेते समय function की domain और principal range पहले जाँचें। / Since \(\sec\theta=\dfrac{1}{\cos\theta}\) and \(\sec 0=1\), the principal value of \(\sec^{-1}1\) is \(0\). The common principal range for \(\sec^{-1}x\) is \([0,\pi]\) excluding \(\pi/2\), so \(\sec^{-1}1=0\). Option \(\pi\) is incorrect because \(\sec\pi=-1\). Options \(\tfrac{\pi}{2}\) and \(-\tfrac{\pi}{2}\) are invalid since \(\sec\) is undefined where \(\cos\theta=0\). Exam tip: always check the principal range and where the original trig function is defined before selecting the inverse value.
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